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LiefLayer : I hope CDPR will make a proper OpenGL based version. But so far OS X was lagging behind with adding OpenGL 4.x support. It only supports OpenGL 4.1 if I'm not mistaken. I suspect REDengine will require more than that. The next version is coming out sometime this year though, so it might update it.
You are right about now supports up to OpenGL 4.1.
What I do not understand is why it should take more than opengl 4.1 (since the output is the latest version 4.4).
Not to mention that the 4.1 version of osx support some functions in version 4.3 (it is not the original version).
I understand that the witcher 3 is a game with few compromises, but as far as I require "only" directx 11, directx 12 do not require (so if on windows do not require the maximum I do not see why do it on a mac).
And as far as I know directx 11 and opengl 4.1 have roughly the same feature.
Not only that, since it will make a version for playstation 4 (which will use opengl) do not really see the problem in making a version for mac.
I recently tried out Hitman Absolution mac and runs very well, even the witcher 2 (without vsync which is apparently buggy) runs very well (although worse respects to Hitman Absolution).
Among other things, the witcher 2 still uses opengl 3.3.
Even looking at one of the missing features more than some small lack in graphics I can not think of any other defects (something that does not interest me at all because at maximum graphics there will never play).
As far as I REDengine also uses a compatibility layer for OSX, which should make porting much easier.
Analyzing all it seems to me that this story dell'opengl 4.x is more of a belief than a few fans of linux (I'm not against linux, I used it for many years, ubuntu and archlinux).
It seems to me, however, that CDprojekt not going to commit to release for mac same time as the PC version and console windows.
This is a real shame given that on gog their philosophy is to give the user maximum freedom and between them there should be freedom to not have to buy a windows license and taking up space on SSD for bootcamp.
I think if you were to release the mac version in the same period of the windows version would give a signal to all software house (which at this time are increasingly making games for other platforms).
Thank you anyway for your response.